I love MR60 for panel mount motor interfacing, but pushing higher and higher amps, it seems like a bottleneck.
I think they are basically 3mm bullets?
60 amps, whether peak or continuous, is pretty low.
Curious about how much motor amps people are running with them. Did you ever melt or deform them?
I know higher voltage kinda solves this, but I’d rather just up the amps and not rebuild the board into HV at this point.
Gon, sound lika a douche now but here it goes.
Thats like saying, man my car does so many rpms on first gear, but dsnt feel very fast 
60 Amps on what? 8S? 20S?
In phase Amps sure, its significantly less then 60ADC cont.
One thing to keep in mind is that VESCs output what is effectively a sinewave for current to the motors, and it measures peak current not RMS current. Kind of like how a 120v outlet is 120v RMS, but 170v from 0v to peak. In the chart below, Voltage and Amp calculations are the same.
This means that an 80A motor current on a VESC is actually 80A*(1/√2) or 80*0.707 = 56.56A on a phase. This is the number that should be used for calculating ohmic heating, which is what effectively sets the current rating of a wire or a connector… how much heat it can handle for what length of time. If you put a simple AC clamp meter on a phase wire, and run FOC_OPENLOOP 80 420, which will output 80A at 60hz on a 14 pole motor, you will measure 56A (ish).
The MR60 has a contact resistance of 0.45mOhms, a constant current rating of 30A and a max current of 60A. Keep in mind that these are based on what the manufacturer considers an acceptable temperature rise, over an acceptable amount of time and may or may not include the heat sinking capability of the 12awg wires.
Also worth mentioning that most “80-100A” VESCs use 0.50mOhm shunts, so similar heating to the MR60. The 12 gauge wire will add roughly 0.2mOhms for a 6 inch length. The MOSFETS RDS(ON) can range from roughly 0.50mOhms to 2mOhm depending on model and number in parallel, and will generate additional heat on top of that from switching losses. Since the VESC thermal throttles based on MOSFET heating, and that is most likely going to be what gets the hottest the fastest, I think using an MR60 on this power level of VESCs would not be the bottleneck.
DroneLab did a great video on the XT60 connector which has the same contact resistance as the MR60. They tested the maximum DC current, which would be equivalent to the RMS current, not the peak current which VESC uses.
60A (85A VESC) - several minutes with light airflow = 70C
180A (255A VESC) - 10 seconds = no damage
200A (283A VESC) - 9s before desoldering
Note that the failure mode is desoldering rather than connector melting.
Oh how i’ve missed you Jake!
Have my babies